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+
+:mod:`crypt` --- Function to check Unix passwords
+=================================================
+
+.. module:: crypt
+ :platform: Unix
+ :synopsis: The crypt() function used to check Unix passwords.
+.. moduleauthor:: Steven D. Majewski <sdm7g@virginia.edu>
+.. sectionauthor:: Steven D. Majewski <sdm7g@virginia.edu>
+.. sectionauthor:: Peter Funk <pf@artcom-gmbh.de>
+
+
+.. index::
+ single: crypt(3)
+ pair: cipher; DES
+
+This module implements an interface to the :manpage:`crypt(3)` routine, which is
+a one-way hash function based upon a modified DES algorithm; see the Unix man
+page for further details. Possible uses include allowing Python scripts to
+accept typed passwords from the user, or attempting to crack Unix passwords with
+a dictionary.
+
+.. index:: single: crypt(3)
+
+Notice that the behavior of this module depends on the actual implementation of
+the :manpage:`crypt(3)` routine in the running system. Therefore, any
+extensions available on the current implementation will also be available on
+this module.
+
+
+.. function:: crypt(word, salt)
+
+ *word* will usually be a user's password as typed at a prompt or in a graphical
+ interface. *salt* is usually a random two-character string which will be used
+ to perturb the DES algorithm in one of 4096 ways. The characters in *salt* must
+ be in the set ``[./a-zA-Z0-9]``. Returns the hashed password as a string, which
+ will be composed of characters from the same alphabet as the salt (the first two
+ characters represent the salt itself).
+
+ .. index:: single: crypt(3)
+
+ Since a few :manpage:`crypt(3)` extensions allow different values, with
+ different sizes in the *salt*, it is recommended to use the full crypted
+ password as salt when checking for a password.
+
+A simple example illustrating typical use::
+
+ import crypt, getpass, pwd
+
+ def login():
+ username = raw_input('Python login:')
+ cryptedpasswd = pwd.getpwnam(username)[1]
+ if cryptedpasswd:
+ if cryptedpasswd == 'x' or cryptedpasswd == '*':
+ raise "Sorry, currently no support for shadow passwords"
+ cleartext = getpass.getpass()
+ return crypt.crypt(cleartext, cryptedpasswd) == cryptedpasswd
+ else:
+ return 1
+